PinoyBIX Engineering Problem Solving and Reference

Below are the answers key for Floyd Self-test in Chapter 17: Voltage Regulators from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. when the input voltage changes, the output voltage stays constant

2. when the load changes, the output voltage stays constant

3. voltage-follower

4. the position of the control element

5. answers (b) and (c)

6. protection of the regulator from excessive current

7. all of the time

8. answers (b) and (c)

9. part of the time

10. answers (d) and (e) only

11. increasing the current that the regulator can handle

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 16: Oscillators from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. requires no input signal

2. a phase shift around the feedback loop of 0°

3. a gain of 1 around the feedback loop

4. 0.02

5. greater than 1

6. positive feedback

7. increases

8. a lead-lag circuit

9. three RC circuits

10. types of LC oscillators

11. stability

12. a VCO

13. the charging and discharging of a capacitor

14. Clock

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 15: Active Filters from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. a single RC circuit

2. answers (a) and (c)

3. two critical frequencies

4. dependent on the critical frequency

5. the center frequency and the bandwidth

6. the response characteristic

7. Butterworth

8. the negative feedback circuit

9. roll-off rate

10. second-order filters

11. increases

12. above the critical frequency

13. answers (b) and (c)

14. greater than the critical frequency of the high-pass filter

15. a summing amplifier and two integrators

16. answers (b) and (c)

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 14: Special-Purpose Op-Amp Circuits from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. three op-amps and seven resistors

2. setting the voltage gain

3. high-noise environments

4. answers (c) and (d)

5. input stage and output stage

6. a capacitor

7. CMRR

8. operational transconductance amplifier

9. a bias current

10. the transconductance and the load resistor

11. voltage-to-current amplifier

12. the logarithmic characteristic of a pn junction

13. answers (b) and (d)

14. e^x

15. for all values of load resistance within defined limits

16. a comparator, a diode, and a capacitor

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 13: Basic Op-Amp Circuits from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. crosses zero

2. comparator

3. change back and forth erratically between two states

4. answers (b) and (d)

5. has two trigger points

6. a portion of the output is fed back to the noninverting input

7. limits the output levels

8. any number of inputs

9. 4.7kΩ

10. 0.2

11. each proportional to the weight of its input

12. capacitor

13. a ramp

14. all of these

15. resistor

16. answers (a) and (b)

17. a square waveform

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 12: The Operational Amplifier from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. two inputs and one output

2. Low power

3. answers (a) and (c)

4. one input is grounded and a signal is applied to the other

5. a signal is applied between the two inputs

6. an identical signal appears on both inputs

7. very low

8. answers (b) and (c)

9. zero

10. 100,000

11. 700 nA

12. 0.67 V/μs

13. zero the output error voltage

14. answers (a) and (c)

15. fed back to the inverting input

16. 101

17. increases

18. remains at 25

19. has all of these

20. increases the input impedance and the bandwidth

21. reduces output error voltage

22. extends from 0 Hz to the upper critical frequency

23. the unity-gain frequency

24. the internal RC circuits

25. answers (a) and (b)

26. 5,000,000 Hz

27. 9 kHz

28. 100 kHz

29. stays the same

30. answers (a) and (c)

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 11: Thyristors from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. three pn junctions

2. diacs and triacs

3. the forward-breakover voltage

4. answers (a) and (b)

5. it has a gate terminal

6. answers (a) and (c)

7. in the off state

8. the device will turn off when the anode current falls below this value

9. answers (a), (b), and (c)

10. like a bidirectional SCR

11. it has two gate terminals

12. either (b) or (c)

13. answers (a) and (b)

14. bilateral conduction

15. triggered on and off by the gate-to-anode voltage

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 10: Amplifier Frequency Response from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. the coupling capacitors

2. the internal transistor capacitances

3. the voltage gain

4. all of these

5. down 3 dB

6. midrange gain

7. 50

8. -3dB/decade

9. answers (b) and (c)

10. 0 Hz

11. 14.14 V

12. transistor capacitances

13. answers (a) and (c)

14. the critical frequencies

15. 6800 Hz

16. remains constant with frequency

17. unity-gain frequency

18. decreases

19. 7.5

20. 4.24 V

21. highest f_cl

22. higher than any individual f_cl

23. a narrower bandwidth

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 9: FET Amplifiers and Switching Circuits from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. answers (a) and (d)

2. 11.4

3. 4.5

4. a current source between drain and source terminals

5. transconductance and gate-to-source voltage

6. the voltage gain will decrease

7. 1.89 V

8. increase

9. 0.86

10. 50 MΩ

11. much lower input resistance

12. CS amplifier

13. a CS and a CG amplifier

14. none of these

15. pulse-width modulation

16. threshold characteristic

17. twice the signal frequency

18. frequency and capacitance

19. an n-channel and a p-channel MOSFET

20. digital circuits

21. V_DD

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 8: Field-Effect Transistors (FETs) from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. answers (a) and (b)

2. drain and source

3. the gate-to-source pn junction reverse-biased

4. V_P

5. pinch-off and breakdown

6. the maximum possible drain current

7. the gate-to-source bias voltage decreases

8. 15 mA

9. completely closed by the depletion region

10. is - 4 V

11. is an n channel

12. 1000 MΩ

13. 2.34 V

14. 0 V

15. all of these

16. biased in the ohmic region

17. answers (b) and (c)

18. the JFET has a pn junction

19. both the depletion and enhancement modes

20. the enhancement mode

21. 0 A

22. reaches V_GS(th)

23. all of these

24. is 20 mA

25. high-voltage applications

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 7: Power Amplifiers from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. Class A

2. 50

3. quiescent current

4. one-half the peak load current

5. 12 W

6. power from the dc power supply

7. 25%

8. right at cutoff

9. class B amplifiers

10. complementary symmetry transistors

11. equal to the current in the bias resistors and diodes

12. 79%

13. 0.4 A

14. slightly less than a class B

15. very low

16. greater than classes A, B, or AB

17. a very small percentage of the input cycle

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 6: Bipolar Junction Transistors Amplifiers from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. uses only a small portion of its load line

2. βac

3. 8.33Ω

4. the voltage gain will decrease

5. 66.7

6. is less

7. 8.95kΩ

8. 180

9. 16.5k Ω

10. 10 mV

11. answers (a) and (b)

12. 8.75M Ω

13. very low

14. 50,625

15. 94.1 dB

16. answers (a) and (c)

17. one input is grounded and a signal is applied to the other

18. opposite polarity signals are applied to the inputs

19. an identical signal appears on both inputs

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 5: Transistor Bias Circuits from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. I_C(sat)

2. V_CE(cutoff) and I_C(sat)

3. answers (a) and (c)

4. βdc and R_E

5. R_IN(BASE) > 10R₂

6. 2.25 V

7. can be essentially independent of βdc

8. answers (a) and (c)

9. is 5.3 mA

10. it is too beta dependent

11. based on the principle of negative feedback

12. the transistor goes into cutoff

13. the transistor may be driven into saturation

14. answers (c) and (d)

15. 0 V

16. 0 mA

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 4: Bipolar Junction Transistors from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. base, emitter, collector

2. emitter and collector

3. positive with respect to the emitter

4. answers (a) and (c)

5. current gain

6. 50

7. 0.7

8. forward-reverse

9. 50

10. an internal ac resistance

11. 110

12. switch

13. answers (c) and (d)

14. minimum

15. Ib>Ic(sat)/ βdc

16. not affect the collector current

17. directly proportional to light intensity

18. Ic= βdcIλ

19. both (b) and (c)

20. V_cc

21. OL

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 3: Special-Purpose Diodes from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. more positive than the anode

2. zener breakdown

3. 10Ω

4. 20 Ω

5. answers(a) and (c)

6. a variable capacitance that depends on reverse voltage

7. emits light when forward-biased

8. produces light with longer wavelengths

9. all of the above

10. both (b) and (c)

11. decrease

12. decreases with light intensity when reverse-biased

13. both (b) and (c)

14. tunnel diode

15. all of the above

Complete List of Floyd Self-test in Electronic Devices

Below are the answers key for Floyd Self-test in Chapter 2: Diodes and Applications . from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. 63.7 V

2. 60 Hz

3. 9.3 V

4. 10 V

5. 47.8 V

6. 120 Hz

7. 62.5 V

8. 200 V

9. 28.3 V

10. the peak value of the rectified voltage

11. 0.005

12. 5.0 V

13. increases

14. changes in output voltage and input voltage

15. changes in load current and output voltage

16. 10 V

17. 5.7 V

18. 169 V

19. 50.9 V

20. 0 V

21. a half-wave rectified voltage

22. there is an open diode

Complete List of Floyd Self-test in Electronic Devices

Below are the answers for the Floyd Self-test in Chapter 1: Introduction to Semiconductors from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd.

1. a unique type of atom

2. answers (b) and (c)

3. protons and neutrons

4. in the most distant orbit from the nucleus

5. a valence electron breaks away from the atom

6. silicon

7. answers(a), (b), and (c)

8. conduction band

9. answers (a), (b), and (c)

10. 14

11. 32

12. 3

13. eight valence electrons, four of its own and four shared

14. thermal energy

15. an electron falls into a hole

16. both electrons and holes

17. answers (b) and (d)

18. doping

19. a p-type semiconductor

20. increase the number of free electrons

21. conduction electrons

22. minority carriers that are thermally produced

23. the boundary of a p-type and an n-type material

24. answers (a), (b), and (c)

25. answers(b) and (c)

26. a dc voltage is applied to control the operation of a device

27. answers (a) and (c)

28. the current is produced both holes and electro

29. there is a very small current due to minority carriers

30. must be greater than 0.7 V

31. conducts current

32. either (b) or (c)

33. forward-biased

34. the voltage across the diode for a given current

35. switch

36. the barrier potential is taken into account

37. all of these

38. approximately 0.7 V

39. OL

Complete List of Floyd Self-test in Electronic Devices